Measure Smart. Live Better.
70+ Free Health, Fitness & Finance Calculators
Immediate educational estimates with clear formulas, stated limitations, and browser-based processing. No accounts. No data stored. Six categories, one hub.
CheckBodyScore is a free suite of 70+ calculators for BMI, body fat, BMR, TDEE, pregnancy, sleep, and finance. Every tool runs privately in your browser, states its formula and limitations, and health tools are reviewed against clinical standards.
Your First Check — BMI, Live
Your Body Mass Index
Category
Health & Body Composition
BMI, body fat, heart age, kidney function — the core body metrics.
Browse Health & Body Composition → Start with the guide: How Accurate Is BMI? →Category
Fitness & Performance
BMR, TDEE, pace, VO2 max — every training number.
Browse Fitness & Performance → Start with the guide: Hitting Your Next PR →Category
Nutrition
Protein, carbs, water, fiber — daily targets that fit your goals.
Browse Nutrition → Start with the guide: Fueling with Macronutrients →Category
Pregnancy & Fertility
Ovulation, due date, fetal growth — each stage, estimated.
Browse Pregnancy & Fertility → Start with the guide: Ovulation and Fertility →Category
Lifestyle & Sleep
Sleep cycles, BAC, footprints — plan the everyday.
Browse Lifestyle & Sleep → Start with the guide: Sleep Cycle Optimization →Category
Medical & Clinical
Blood pressure, lab values, dosing — the clinical numbers.
Browse Medical & Clinical → Start with the guide: Blood Pressure Numbers Explained →Category
Personal Finance
Mortgages, retirement, budgets — decisions with math behind them.
Browse Personal Finance → Start with the guide: Compound Interest & Retirement →Built to Be Trusted
Clinically Reviewed
Health tools follow a formal review process against CDC, WHO, and NIH guidance — reviewer and date published on every page.
100% Private
Calculations run entirely in your browser. No accounts, no databases, no third-party scripts — nothing you type ever leaves your device.
Formulas Stated
Every tool publishes its equation, assumptions, and limitations on the page — no black boxes, no false precision.
Free, Forever
No subscriptions, no paywalls, no ads. 70+ tools, unlimited use, for everyone.
Category Guides — Every Tool Covered
Frequently Asked Questions
Which calculator should I start with?
Start with BMI — it is the fastest health snapshot. If you already track fitness, try TDEE; for pregnancy planning, start with the ovulation calculator. Every tool links to the next logical check.
Are CheckBodyScore calculators accurate?
Every tool uses formulas published by authoritative bodies such as CDC, WHO, NIH, and IRS, states its method and limitations on the page, and health tools follow a clinical-review process with the reviewer and date published.
Is my data private?
Yes — completely. Calculations run in your browser with no accounts, no storage, and no third-party scripts. Nothing you enter ever leaves your device.
What is the difference between BMI and body fat percentage?
BMI estimates body fat from height and weight, while body fat percentage measures the proportion of fat mass directly. Body fat percentage is more precise but requires measurement equipment.
Have an idea for a calculator?
We review suggestions weekly and ship the useful ones free. Or report a formula issue — corrections land fast.